Extruder is a device that converts mechanical energy into thermal energy and is used to process extruded food or extruded feed.  Working principleThe machine generates heat through rotation, so that the food or material is cooked and the volume increases during the extrusion process.Application fields1. Food field: It can process raw materials such as rice, corn, soybeans, wheat, etc. to make various extruded foods, such as popcorn, Kang Le Guo, etc.2. Feed field: It is used to produce livestock and poultry feed, aquatic feed and pet feed, improve the digestibility and utilization rate of feed, and increase palatability.3. Industrial field: It can be used for the pretreatment of certain raw materials, such as the extrusion pretreatment of raw materials in the production of vegetable oils and drinking wine.Classification1. According to the screw structure: there are single-screw extruders and twin-screw extruders. The single-screw structure is simple, and the twin-screw can expand viscous materials with stable discharge.2. According to the conditioning method: It can be divided into wet extruders and dry extruders. Steam is added during the conditioning of wet extruders, but no steam is added during the conditioning of dry extruders.Main componentsIncludes extruder screw, extruder discharge die, bearing box, oil filtration and cooling system, etc.